You learn two maneuvers of your choice from the Battle Master archetype. If the maneuver requires a saving throw, the DC is equal to 8 + your proficiency bonus + your Strength or Dexterity modifier (your choice).
You gain 1 superiority die (if you don't already have superiority dice, it is a d6). This die is used to fuel your maneuvers. It is expended when you use it, and is regained when you finish a short or long rest.